Carnegie Institution of Washington publication.

no. 291 (1919)

Proceedings of the Academy of Natural Sciences of Philadelphia.

v.71 (1919)

Proceedings of the Entomological Society of Washington.

v. 21-22 1919-1920

Bulletin of the Bureau of Fisheries.

v.37 (1919-1920)

Bulletin of the Department of Agriculture, Trinidad and Tobago.

18, 1919

The Canadian entomologist.

v. 51 (1919)

The Irish naturalist.

v.28 (1919)

Botanical gazette.

v.68 (1919)

Botanical gazette.

v.67 (1919)

The Philippine journal of science.

v.14 (1919)

The Philippine journal of science.

v.15 (1919)

The illustrated dictionary of gardening :a practical and scientific encyclopædia of horticulture for gardeners and botanists /edited by George Nicholson ; assisted by J.W.H. Trail ... and J. Garrett ...

v. 1

The illustrated dictionary of gardening :a practical and scientific encyclopædia of horticulture for gardeners and botanists /edited by George Nicholson ; assisted by J.W.H. Trail ... and J. Garrett ...

v. 2

The illustrated dictionary of gardening :a practical and scientific encyclopædia of horticulture for gardeners and botanists /edited by George Nicholson ; assisted by J.W.H. Trail ... and J. Garrett ...

v. 3

The illustrated dictionary of gardening :a practical and scientific encyclopædia of horticulture for gardeners and botanists /edited by George Nicholson ; assisted by J.W.H. Trail ... and J. Garrett ...

v. 4